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Inventories (Tables)
12 Months Ended
Dec. 31, 2023
Inventory Disclosure [Abstract]  
Inventories
Inventories (principally using the LIFO method) are comprised of the following:
 
 December 31,
(Millions of dollars)20232022
Raw materials$6,492 $6,370 
Work-in-process1,411 1,452 
Finished goods8,308 8,138 
Supplies354 310 
Total inventories$16,565 $16,270